Last visit was: 14 Jul 2025, 01:12 It is currently 14 Jul 2025, 01:12
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 13 Jul 2025
Posts: 102,569
Own Kudos:
Given Kudos: 98,178
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,569
Kudos: 741,182
 [16]
1
Kudos
Add Kudos
15
Bookmarks
Bookmark this Post
Most Helpful Reply
User avatar
GMATWhizTeam
User avatar
GMATWhiz Representative
Joined: 07 May 2019
Last visit: 03 Jul 2025
Posts: 3,384
Own Kudos:
2,075
 [5]
Given Kudos: 68
Location: India
GMAT 1: 740 Q50 V41
GMAT 2: 760 Q51 V40
Expert
Expert reply
GMAT 2: 760 Q51 V40
Posts: 3,384
Kudos: 2,075
 [5]
1
Kudos
Add Kudos
4
Bookmarks
Bookmark this Post
General Discussion
User avatar
Archit3110
User avatar
Major Poster
Joined: 18 Aug 2017
Last visit: 13 Jul 2025
Posts: 8,348
Own Kudos:
Given Kudos: 243
Status:You learn more from failure than from success.
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1: 545 Q79 V79 DI73
GPA: 4
WE:Marketing (Energy)
GMAT Focus 1: 545 Q79 V79 DI73
Posts: 8,348
Kudos: 4,825
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
PoojanB
Joined: 09 May 2017
Last visit: 08 Dec 2020
Posts: 81
Own Kudos:
Given Kudos: 69
Location: India
GMAT 1: 610 Q42 V33
GMAT 2: 620 Q45 V31
GPA: 4
WE:Engineering (Energy)
GMAT 2: 620 Q45 V31
Posts: 81
Kudos: 94
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi,Archit3110

I guess there are couple of mistakes (Not in the final answer though ;) ),i have marked the errors in red in your quoted answer.
Day 3= x+20
and
690/3=230 and not 330.
Hence x=100.
However as far as it is DS,none of it would matter :D
Please correct me if i am wrong.


Archit3110
target to determine is earning value of day 1
each day Dan earns $10 more than other day
so day 1 = x
day 2 = x+10
day 3 = x+30
so on till day 15 ; x+140
#1
His total earnings for the three most recent work days equal $690.
recent three days ; day 13,14,15 ; and day 14 value would be mean of 690 ; 690/3 ; $330
so day x+130=330
x= $200

sufficient
#2
His total earnings for the three most recent work days exceed his total earnings for the first three work days by $360
three most recent days salary
3x+ ( 120+130+140) ; 3x+ 390
and salary of first 3 days ; 3x+(10+20) ; 3x+30
we are given
3x+390=3x+30+360
value of x cannot be determined
insufficient
IMO A


Bunuel
Each day at Dan’s new job, he earns $10 more than the day before. If he just completed his 15th day of work, how much did he earn on his first day?

(1) His total earnings for the three most recent work days equal $690.

(2) His total earnings for the three most recent work days exceed his total earnings for the first three work days by $360


Are You Up For the Challenge: 700 Level Questions
­
User avatar
minustark
Joined: 14 Jul 2019
Last visit: 01 Apr 2021
Posts: 471
Own Kudos:
388
 [1]
Given Kudos: 52
Status:Student
Location: United States
Concentration: Accounting, Finance
GMAT 1: 650 Q45 V35
GPA: 3.9
WE:Education (Accounting)
Products:
GMAT 1: 650 Q45 V35
Posts: 471
Kudos: 388
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
[quote="Bunuel"]Each day at Dan’s new job, he earns $10 more than the day before. If he just completed his 15th day of work, how much did he earn on his first day?

(1) His total earnings for the three most recent work days equal $690.

(2) His total earnings for the three most recent work days exceed his total earnings for the first three work days by $360
The pattern of earnings : a, a+ 10, a+20, a+30....So on the 15th day the earnings will be a +140.
1) 3a+ (140+130+120) = 690. Sufficient
2) (3a + 390) -( 3a +30) = 360. a rules out. Not Sufficient.
A is the answer.
avatar
JadAsmar
avatar
Current Student
Joined: 13 Apr 2021
Last visit: 06 Jun 2022
Posts: 30
Own Kudos:
Given Kudos: 180
Location: Lebanon
Posts: 30
Kudos: 1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Note that the daily increase is consistent: he always earns $10 more each day. This is essentially a consecutive integer problem (although, in this case, there are increments of 10, not 1). Use f to represent Dan’s earnings on the first day. Express his earnings on subsequent days as f + 10, f + 20, f + 30, … f + 140.

(1) SUFFICIENT: This statement provides the sum of the most recent three days:

(f + 120) + (f + 130) + (f + 140) = $690
3f + 390 = $690
3f = $300
f = $100

Dan earned $100 on his first day.

(2) INSUFFICIENT: This statement provides the difference between the totals for the first three days and the last three days:

First three days = (f) + (f + 10) + (f + 20) = 3f + 30
Last three days = (f + 120) + (f + 130) + (f + 140) = 3f + 390
Last three days − First three days = (3f + 390) − (3f + 30) = $360

This statement is always true, regardless of how much Dan made on the first day. (This information can be determined from the question stem alone!)
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 37,377
Own Kudos:
Posts: 37,377
Kudos: 1,010
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Moderator:
Math Expert
102569 posts